1·Some leaves started to turn yellow and the weather became cool.
树叶开始变黄了，天气也转凉了。
2·In autumn, quite a few leaves turn yellow and fall off the trees.
在秋天，很多树叶变黄并从树上落下。
3·Why do newspapers turn yellow over time?
随着时间的流逝，报纸为什么会变黄呢？
4·They turn yellow along the way and are ready to be sold.
它们在路上变黄，准备好被出售了。
5·With winter coming, leaves of trees turn yellow and begin to fall.
随着冬天的到来，树叶变黄，开始飘落。
6·With autumn coming on, the days are getting cooler and the leaves are beginning to turn yellow.
随着秋天的到来，天气变得更冷了，并且树叶开始变黄了。
7·The colours are magnificent, but the question of exactly why some trees turn yellow or orange, and others red or purple, is something which has long puzzled scientists.
这些颜色很瑰丽，但究竟为什么有些树会变成黄色或橙色，而有些树会变成红色或紫色，这个问题一直困扰着科学家。
8·Leaves turn yellow in autumn.
树叶到秋天就变黄了。
9·Leaves of the tree turn yellow.
树上的叶子变黄了。
10·The leaves turn yellow in autumn.
秋天，树叶变黄了。英语怎么说。